no dream is good stand for sleeping well

i've heard that if you can remember what you dream while you were asleep ,it shows that you had bad sleeping that made you even more tired.... but if you can't, means your sleeping was great( serve as you were really relaxed while were asleep)

That happens to me too. If you really want to remember what you were dreaming about, you could write it in a notebook as soon as you wake up.

It's very common I think. Actually, we always dream while sleeping, however not always we remember what we dreamed.  There are entire weeks where I don't remember anything at all, and there are others where I remember almost everything.